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Old 02-07-2016, 11:01 PM   #1
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Red=Positive ???

I took the battery out for the winter and now that I'm ready to install it, not sure which wire is the positive. I have a red wire and a white going to the battery box I would think that the red would be positive?? am I right
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Old 02-07-2016, 11:04 PM   #2
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Red should be positive.
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Old 02-07-2016, 11:05 PM   #3
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What color is your RV because we dont know what kind or model it is? Youroo!!
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Old 02-07-2016, 11:23 PM   #4
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Yes, red is positive. If you have a multi-meter you can verify this. Measure on the ohms scale between the white wire and some part of the chassis of the trailer. (find some bare metal or a screw, bolt, or nut) It should measure 0 ohms or a dead short.
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Old 02-07-2016, 11:34 PM   #5
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White is almost always neg.black or red is positive.Unfortuneatly there is no "code" for low voltage wireing,but what I stated above will cover 95% of any factory instalations.
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Old 02-07-2016, 11:41 PM   #6
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Just make sure you are on the lowest ohms scale, especially if you are using an analog meter. On the higher ranges, your meter may measure full swing through internal circuits such as a light bulb. Also make certain the shorepower is unplugged first. Ohm meters don't like voltage/current.
Another test is to insulate the red and white cable ends, then plug the unit in and check polarity from your converter, but I would de power any other 12 volt appliances, like radios. Our 12 v batteries make better regulators than some converters.
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Old 02-08-2016, 09:33 PM   #7
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Thank you all good replies, I figured it was positive but was use to seeing black also.
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Old 02-08-2016, 11:47 PM   #8
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What color is your RV because we dont know what kind or model it is? Youroo!!
It looks as though it is white and brown.
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Old 02-09-2016, 12:06 AM   #9
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Red is negative in the telecommunications world... and it's -48VDC. Everywhere else, red's positive... that I know of anyway.
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Old 02-09-2016, 09:21 AM   #10
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Could there be a small wrap of black electrical tape on the white wire close to the lug that you overlooked?
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Old 02-09-2016, 11:28 AM   #11
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On most RVs, the negative battery lead goes to the chassis ground and the positive goes to the battery controller. Follow your leads and find the chassis ground, it shouldn't go far.
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Old 02-09-2016, 03:02 PM   #12
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White is almost always neg.black or red is positive.Unfortuneatly there is no "code" for low voltage wireing,but what I stated above will cover 95% of any factory instalations.
Where white is used, that is true (assuming wiring was coded to begin with).

Marine and automotive standard is red = positive, and black = negative.

House wiring (120V): Black = hot, white = neutral, green = ground, red = switched (for 3 way switches, ceiling fans, etc).

RV wiring: who knows? Depends on what the installer had handy. The entire back side of my converter/distribution panel is white. The white wires are connected to an array of red, black and white wires with crimp-on wire nuts. As an engineer (electrical), I am absolutely disgusted. And yet everything works!

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Old 02-09-2016, 08:52 PM   #13
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What doesn't make any sense is if red = positive and white = ground, why is there no black wire for the negative... there are only 2 wires red and white on my trailer.

Rich
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Old 02-09-2016, 09:04 PM   #14
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What doesn't make any sense is if red = positive and white = ground, why is there no black wire for the negative... there are only 2 wires red and white on my trailer.

Rich
Ground is the same as negative in 12V systems. Only exception I know of is electrics by Lucas aka Prince of Darkness. Early MGs used Lucas and had positive grounds.
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Old 02-09-2016, 09:07 PM   #15
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Could there be a small wrap of black electrical tape on the white wire close to the lug that you overlooked?

Just went to look and there is a small wrap of electrical close to the end of the RED lug???
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Old 02-09-2016, 09:14 PM   #16
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Ground is the same as negative in 12V systems. Only exception I know of is electrics by Lucas aka Prince of Darkness. Early MGs used Lucas and had positive grounds.

Thank you pgandw for setting me straight on that, thought I was loosing it.
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Old 02-19-2016, 08:49 PM   #17
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At least you were smart enough to ask I blew fuses the first time I put battery back in wrong....
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Old 02-19-2016, 10:25 PM   #18
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brownie289 I bet you aren't the only one who has done that. However you might be the only one that's willing to admit your error.
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Old 02-20-2016, 08:04 AM   #19
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brownie289 I bet you aren't the only one who has done that. However you might be the only one that's willing to admit your error.
Now clearly marked w a sharpie marker in the box
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Old 02-21-2016, 09:09 AM   #20
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I took the battery out for the winter and now that I'm ready to install it, not sure which wire is the positive. I have a red wire and a white going to the battery box I would think that the red would be positive?? am I right
The fastest way I know is to find the wire that goes to a bolt in the frame. THAT (regardless of color) is ground. The other one (regardless of color) is "hot".

While you are there, you might consider removing it; wire brush the rust; and reinstall it.
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